SQ's + answers-L13-14-Annelida

SQ's + answers-L13-14-Annelida - BIS 1B (Winter 2008) Study...

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BIS 1B (Winter 2008) Study questions: Annelida (lectures 13-14) 1. What parts of an annelid show serial repetition in successive body segments? Structures involved in locomotion (setae, parapodia), elements of the nervous system, excretory system (metanephridia), circulatory system, gas exchange system, and the coelomic compartment are all repeated in most body segments. 2. In what ways do polychaetes differ from other Annelida? They are marine worms (most other annelids are terrestrial or freshwater aquatic). Polychaetes have a distinct head with tentacles and other sensory structures; paired lateral segmental appendages called parapodia; separate sexes; and (usually) a trochophore larva. Polychaetes also lack a clitellum, a thickened, mucus-secreting mid body swelling seen in other annelids. 3. How do leeches feed? Most leeches are fluid-feeders. Predacious species that attack small invertebrates grasp their prey with an oral sucker, and use their strong protrusible pharynx (proboscis) to suck up fluids and soft tissues. Many leeches are blood-feeding ectoparasites of vertebrates. They anchor to the host with suckers and make incisions in the host's skin with blade-like jaws. They produce anesthetics (pain-killers), an anticoagulant ("hirudin", which prevents the host's blood from
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SQ's + answers-L13-14-Annelida - BIS 1B (Winter 2008) Study...

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